Document project setup

README.md

@@ -11,7 +11,37 @@ are made about the security or privacy of your data. (No warranty etc
 etc.)**
 
 This project is a work in progress, and I don't intend on thoroughly
-documenting it until it has reached feature-completeness. As such,
-you have reached the end of the README :)
+documenting it until it has reached feature-completeness.
+
+## Project setup
+
+To run the webserver, all you need is Yarn. Just run `yarn install` as
+usual to install dependencies. For production, it's:
+
+    $ yarn backend
+    $ yarn frontend
+    $ yarn server
+
+For development with file watching and automatic server rebooting and
+all that, it's:
+
+    $ yarn backend-dev
+    $ yarn frontend-dev
+    $ yarn server-dev
+
+The webserver listens on `localhost:6119`. Now, although the server
+itself will work, the only languages that will work are the ones that
+happen to be installed on your machine. (I'm sure you can find a few
+that are already.) If you want to test with *all* the languages (or
+you're working on adding a new language), then you need to use Docker.
+Running the app is exactly the same as before, you just have to jump
+into the container first:
+
+    $ make docker
+
+Note that building the image takes 30 minutes and requires about 15 GB
+of disk space.
+
+## Flag
 
 [![Flag](flag.png)](https://www.reddit.com/r/Breath_of_the_Wild/comments/947ewf/flag_of_the_gerudo_based_on_the_flag_of_kazakhstan/)